CVE-2026-13318
Virt-api-rhel9: kubevirt: kubevirt: ssrf in virt-api port-forward via unvalidated guest-agent-reported ip
Description
A server-side request forgery (SSRF) flaw was found in KubeVirt's virt-api port-forward handler. When processing a port-forward request to a VirtualMachineInstance (VMI), virt-api reads the target IP from vmi.Status.Interfaces[0].IP and passes it directly to net.Dial() without validation. For VMIs using non-masquerade network bindings (bridge or secondary-only), this IP is reported by the QEMU guest agent running inside the VM and is fully controllable by the VM owner. An attacker with kubevirt.io:edit permissions can create a VM with a modified guest agent that reports an arbitrary IP address, then request port-forward to establish a bidirectional TCP tunnel from virt-api's cluster-internal network position to any routable destination, bypassing NetworkPolicy isolation.
INFO
Published Date :
June 25, 2026, 11:23 p.m.
Last Modified :
June 25, 2026, 11:23 p.m.
Remotely Exploit :
Yes !
Source :
redhat
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 53f830b8-0a3f-465b-8143-3b8a9948e749 |
Solution
- Validate target IP addresses in port-forward requests.
- Sanitize input from the QEMU guest agent.
- Restrict port-forwarding capabilities for untrusted users.
- Update KubeVirt to the latest secure version.
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CVE-2026-13318 vulnerability anywhere in the article.